Find a rectangular equation for the curve with the given parametric equations.x = 5 tan t, y = 3 sec t; for t in [-?, ?]
A. y = 3
B. 
- 
= 1
C. y = x2 - 9
D. 
+ 
= 1
Answer: B
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Find the exact value of the expression.cos (30° + 45°)
A. 
B. 
C. 
D. 
Solve the problem.The equation D = 
n(n - 3) gives the number of diagonals D for a polygon with n sides. Use this equation to solve the problem. Find the number of sides n for a polygon that has 90 diagonals.
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Find the domain of the given function.f(x) = 
A. all real numbers x where x ? -3
B. all real numbers x where x ? 
C. all real numbers x where x > 3
D. all real numbers x where x > - 